What words must be marked on a patrol car with an amber light bar?

The requirement for marking patrol cars with an amber light bar is specifically aimed at ensuring clear communication about the function of the vehicle. The phrase "Private Security" directly conveys that the vehicle is associated with a private security service rather than a law enforcement or emergency response entity. This distinction is vital for public clarity and helps to manage expectations regarding the authority and capabilities of the security personnel.

The other phrases do not fully or accurately represent the role of private security in relation to the amber light bar. The term "Security Services" is broader and can apply to various security functions without specifically indicating that the service is private. "Emergency Response" implies a relationship with public emergency services, which could cause confusion among the public, as it suggests capabilities that private security does not possess. Lastly, "Security Enforcement" may imply a level of authority akin to law enforcement, which is not accurate for private security entities. Therefore, "Private Security" is the correct designation to ensure appropriate identification and understanding of the vehicle's purpose.